DESIGN, CONSTRUCTION AND TESTING OF A HEAT OF VAPORIZATION CALORIMETER USEFUL IN THE VAPOR PRESSURE RANGE 1 TO 0.001 (0.0001) MM HG AT 25 C.
Final technical rept. no. 1, 1 Jan 63-1 Jan 64,
LUND UNIV (SWEDEN)
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A micro-calorimeter was built with the purpose of determining heats of vaporization of substances in the vapor pressure range ca. 1 to 10 to the minus3 to 10 to the minus 4 mm Hg. The calorimeter consists of a Knudsen-cell from which the substance is evaporated directly into highvacuum space. Special care has been taken to ascertain iso-thermal working conditions and to prevent contamination of the vacuum system by vapors, harmful increase of pressure due to the presence of vapor outside the calorimeter and heat leak errors. The system has been partly checked, final testing and preliminary measurements are now under way. Author